CLVM failed on local socket when configure

Hi All,

I would like to setup CLVM + GFS2 on RHEL 7 and faced

~]# lvmconf --enable-cluster
~]# systemctl reboot

and after reboot, i see this...

~]# lvs
connect() failed on local socket: No such file or directory
Internal cluster locking initialisation failed.
WARNING: Falling back to local file-based locking.
Volume Groups with the clustered attribute will be inaccessible.
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
root rhel -wi-ao---- 77.51g
swap rhel -wi-ao---- 2.00g

~]# pvs
connect() failed on local socket: No such file or directory
Internal cluster locking initialisation failed.
WARNING: Falling back to local file-based locking.
Volume Groups with the clustered attribute will be inaccessible.
PV VG Fmt Attr PSize PFree
/dev/sda2 rhel lvm2 a-- 79.51g 0

This is bug or feature?

How i can fix it?